specs,nextcloud: Fix news article

packages/nextcloud/lib/src/nextcloud.openapi.dart

@@ -1670,7 +1670,7 @@ class NewsArticle {
     required this.id,
     required this.guid,
     required this.guidHash,
-    required this.url,
+    this.url,
     required this.title,
     this.author,
     required this.pubDate,
@@ -1697,7 +1697,7 @@ class NewsArticle {
 
   final String guidHash;
 
-  final String url;
+  final String? url;
 
   final String title;
 

packages/nextcloud/lib/src/nextcloud.openapi.g.dart

@@ -1002,7 +1002,7 @@ NewsArticle _$NewsArticleFromJson(Map<String, dynamic> json) => NewsArticle(
       id: json['id'] as int,
       guid: json['guid'] as String,
       guidHash: json['guidHash'] as String,
-      url: json['url'] as String,
+      url: json['url'] as String?,
       title: json['title'] as String,
       author: json['author'] as String?,
       pubDate: json['pubDate'] as int,

packages/nextcloud/lib/src/nextcloud.openapi.json

@@ -1162,7 +1162,6 @@
           "id",
           "guid",
           "guidHash",
-          "url",
           "title",
           "pubDate",
           "body",

specs/news.json

@@ -144,7 +144,6 @@
           "id",
           "guid",
           "guidHash",
-          "url",
           "title",
           "pubDate",
           "body",